Portion of an image for a display screen



The FIGURE is a front view of a portion of an image for a display screen showing my new design.

The area defined within the broken line rectangle near the center of the icon is not a part of the claimed design. The broken line drawing of a display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of an image for a display screen, as shown and described. 